CN108757054B - Steam turbine partition plate sealing structure - Google Patents
Steam turbine partition plate sealing structure Download PDFInfo
- Publication number
- CN108757054B CN108757054B CN201810694843.4A CN201810694843A CN108757054B CN 108757054 B CN108757054 B CN 108757054B CN 201810694843 A CN201810694843 A CN 201810694843A CN 108757054 B CN108757054 B CN 108757054B
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- Prior art keywords
- outer ring
- partition plate
- sealing block
- sealing
- steam turbine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/005—Sealing means between non relatively rotating elements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/24—Casings; Casing parts, e.g. diaphragms, casing fastenings
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The invention discloses a steam turbine partition plate sealing structure, which comprises a cylinder and a partition plate; a partition plate outer ring mounting groove is formed in the inner wall of the cylinder; a scapular part is arranged on the outer ring of the partition plate and inserted into the mounting groove of the outer ring of the partition plate; the inner ring of the clapboard is fixedly arranged on the inner wall of the cylinder through a screw; the outer ring of the clapboard is also provided with a sealing block; the sealing block is positioned on one side of the scapular part; the sealing block and the scapular part are inserted into the mounting groove of the outer ring of the partition plate together; the sealing block can expand after being heated, so that the surfaces of the joint of the partition plate outer ring, the scapular part and the partition plate outer ring mounting groove and the sealing block are tightly attached. The sealing structure seals the outer ring of the clapboard through the sealing block and seals the inner ring of the clapboard through the screw connection; the sealing effect between the inner ring and the outer ring of the clapboard and the inner wall of the cylinder is ensured.
Description
Technical Field
The invention relates to the field of design of a steam turbine partition plate, in particular to a sealing structure of a first-stage partition plate of an impulse steam turbine.
Background
The turbine diaphragm and the rotor are arranged together in the cylinder to form an important through-flow component of the turbine. As shown in FIG. 1, a diaphragm of a steam turbine includes a diaphragm outer ring 1-1, stationary blades 1-2, and a diaphragm inner ring 1-3; the baffle plate is arranged on the inner wall of the cylinder through an outer ring; the clapboard is used as the most main stator part of the impulse type unit, and the sealing effect of the clapboard directly influences the efficiency of the unit. For a steam turbine set adopting throttling steam distribution, high-temperature and high-pressure steam from a valve directly enters a through-flow component to start work, and the pressure and the temperature borne by the first-stage static blade and the first-stage moving blade in the through-flow component are the highest, so that the requirement on the working strength of the component at the position is relatively high. In order to ensure the safety of the rotor and reduce the temperature of high-temperature steam born by the rotor, for an impulse type unit, an inner ring of a first-stage clapboard is usually assembled on the inner wall of a cylinder, so that the high-temperature steam is prevented from directly impacting the rotor. The sealing surfaces of the steam outlet sides of the inner ring and the outer ring of the partition plate are respectively tightly attached to the inner wall of the cylinder by means of the pressure difference between the front and the rear of the partition plate in a working state, and steam leakage is prevented. In the actual processing installation, can not guarantee that baffle inner and outer loop can paste with the cylinder inner wall simultaneously tightly, after the unit operation a period of time, easy deformation, scale deposit on the sealed face simultaneously lead to the sealed effect of steam-out side poor, influence unit efficiency.
Disclosure of Invention
The invention aims to: aiming at the existing problems, the sealing structure of the steam turbine partition plate is provided, the outer ring of the partition plate is sealed through the sealing block, and the inner ring of the partition plate is sealed through screw connection; the sealing effect between the inner ring and the outer ring of the clapboard and the inner wall of the cylinder is ensured.
A kind of steam turbine baffle seal structure, it includes cylinder and baffle; a partition plate outer ring mounting groove is formed in the inner wall of the cylinder; a scapular part is arranged on the outer ring of the partition plate and inserted into the mounting groove of the outer ring of the partition plate; the inner ring of the clapboard is fixedly arranged on the inner wall of the cylinder through a screw; the outer ring of the clapboard is also provided with a sealing block; the sealing block is positioned on one side of the scapular part; the sealing block and the scapular part are inserted into the mounting groove of the outer ring of the partition plate together; the sealing block can expand after being heated, so that the surfaces of the joint of the partition plate outer ring, the scapular part and the partition plate outer ring mounting groove and the sealing block are tightly attached.
In above-mentioned structure, the baffle outer loop seals through sealed piece, because sealed piece can expand after being heated, consequently when the steam turbine at the during operation, the high temperature high pressure steam in the steam turbine makes sealed piece expand in baffle outer loop mounting groove, makes one side and the baffle outer loop mounting groove lateral wall of sealed piece closely laminate, and opposite side and shoulder blade side decryption laminating have then guaranteed the sealed effect of baffle outer loop in the work, prevent steam leakage. And the inner ring of the partition board is connected with the inner wall of the cylinder through bolts, so that the inner ring and the cylinder can be tightly attached in the installation and working states, and steam leakage is prevented.
Furthermore, the partition plate outer ring installation groove is annularly formed on the inner wall of the cylinder; the scapular part is annularly arranged on the outer ring of the clapboard; the outer ring of the partition plate is provided with a plurality of sealing blocks, and the sealing blocks wrap the outer ring of the partition plate for one circle; the scapular part and each sealing block are arranged in the installation groove of the outer ring of the partition plate.
Furthermore, when the sealing blocks are not heated, a cold gap is formed between every two adjacent sealing blocks. The cold state gap can ensure that the sealing block has enough expansion space under the working state.
Furthermore, the cold state gap between each two adjacent sealing blocks is 0.3-0.5 mm.
Further, each sealing block is arc-shaped.
Further, the sealing block is fixedly arranged on the outer ring of the clapboard through screws.
Further, the sealing block is made of a metal material with a large linear expansion coefficient. The sealing block is guaranteed to be easy to expand when being heated, and sealing efficiency is improved.
Furthermore, when the sealing block is not heated, a mounting gap is reserved between the sealing block and the bottom of the mounting groove of the outer ring of the partition plate. The convenient sealing block and the scapular part are arranged in the mounting groove of the outer ring of the clapboard.
Furthermore, the installation clearance is 0.05-0.1 mm.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
the outer ring of the partition plate is tightly sealed in the installation groove of the outer ring of the partition plate through the expansion of the sealing block, so that the sealing between the outer ring of the partition plate and the inner wall of the cylinder is ensured; the steam leakage between the outer ring of the partition plate and the inner wall of the cylinder is avoided, the phenomenon that the sealing surface cannot be sealed due to the gap between the shoulder blade surface of the partition plate and the inner wall of the installation groove of the outer ring of the partition plate caused by the deformation in the use process is avoided, and the installation between the outer ring of the partition plate and the installation groove of the outer ring of the partition plate is facilitated. Meanwhile, the inner ring of the partition plate is directly fixed on the inner wall of the cylinder through the screws, so that the inner ring of the partition plate and the cylinder can be tightly attached in the installation and working states, and steam leakage is prevented.
Drawings
FIG. 1 is a sectional view of a separator;
FIGS. 2 and 3 are views showing the structure of the seal between the partition and the cylinder;
FIG. 4 is a view showing the arrangement of seal blocks on the outer ring of the diaphragm;
fig. 5 is a partially enlarged view of a space between two adjacent seal blocks.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The embodiment discloses a sealing structure of a first-stage partition plate 1 of a 1000MW impulse turbine, which comprises a cylinder 2 and the partition plate 1; a partition plate outer ring mounting groove is formed in the inner wall of the cylinder 2; a scapular part 1-4 is arranged on the outer ring 1-1 of the partition plate, and the scapular part 1-4 is inserted into the mounting groove of the outer ring of the partition plate; the inner ring 1-3 of the clapboard is fixedly arranged on the inner wall of the cylinder 2 through screws; the outer ring 1-1 of the clapboard is also provided with a sealing block 3, and each sealing block 3 is fixedly arranged on the outer ring 1-1 of the clapboard through a screw; the sealing block 3 is positioned on one side of the scapular part 1-4; the sealing block 3 and the scapular part 1-4 are inserted into the mounting groove of the outer ring of the partition plate together; the sealing block 3 expands after being heated, so that the surfaces of the joint of the partition plate outer ring 1-1, the scapular part 1-4 and the partition plate outer ring mounting groove with the sealing block 3 are tightly attached. The partition plate outer ring installation groove is annularly formed in the inner wall of the cylinder 2; the scapular part 1-4 is annularly arranged on the outer ring 1-1 of the clapboard; a plurality of sealing blocks 3 are arranged on the outer ring 1-1 of the partition plate, and the sealing blocks 3 are arranged by wrapping the outer ring 1-1 of the partition plate for one circle; the scapular parts 1-4 and the sealing blocks 3 are all arranged in the installation grooves of the outer ring of the partition plate. The number of the sealing blocks 3 is 4-20, and in the embodiment, the number of the sealing blocks 3 is 16.
When the sealing blocks 3 are not heated, a cold gap is formed between every two adjacent sealing blocks 3. In this embodiment, the cold gap between two adjacent sealing blocks 3 is 0.3-0.5 mm.
As shown in FIG. 4, each sealing block 3 is arc-shaped and is arranged on the outer ring 1-1 of the clapboard in a matching way.
The sealing block 3 is made of a metal material with a large linear expansion coefficient.
The main steam temperature of the 1000MW impulse turbine is 600 ℃, the cylinder material is Cr-Mo-W-V cast steel, the inner ring 1-3 and the outer ring of the first-stage clapboard are made of Cr-Mo-W-V forged piece materials, and the linear expansion coefficients of the two materials are 12-12.5 multiplied by 10 at 600 DEG C-6℃-1To (c) to (d); the adjusting shim is made of Cr-Ni stainless steel material, and the linear expansion coefficient at 600 ℃ is 18-19 multiplied by 10-6℃-1In the meantime.
And in an unheated state of the sealing block 3, a mounting gap is reserved between the sealing block 3 and the bottom of the mounting groove of the outer ring of the partition plate. The installation clearance is 0.05-0.1 mm.
According to the invention, each arc-shaped sealing block 3 is heated to expand under the action of high-temperature steam, so that the sealing blocks 3 are tightly attached to the inner wall of the installation groove of the outer ring of the partition plate and the side walls of the shoulder blade parts 1-4, and the outer ring 1-1 of the partition plate is sealed with the cylinder 2. Meanwhile, the inner ring 1-3 of the clapboard is arranged on the cylinder 2 through screws, so that the sealing between the inner ring 1-3 of the clapboard and the cylinder 2 is realized.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A steam turbine diaphragm seal structure which characterized in that: it comprises a cylinder (2) and a clapboard (1); a partition plate outer ring mounting groove is formed in the inner wall of the cylinder (2); a scapular part (1-4) is arranged on the outer ring (1-1) of the partition plate, and the scapular part (1-4) is inserted into the mounting groove of the outer ring of the partition plate; the inner ring (1-3) of the clapboard is fixedly arranged on the inner wall of the cylinder (2) through screws; the outer ring (1-1) of the clapboard is also provided with a sealing block (3); the sealing block (3) is positioned on one side of the scapular part (1-4); the sealing block (3) and the scapular part (1-4) are inserted into the mounting groove of the outer ring of the partition plate together; the sealing block (3) can expand after being heated, so that the surfaces of the connecting parts of the partition plate outer ring (1-1), the scapular part (1-4) and the partition plate outer ring mounting groove and the sealing block (3) are tightly attached.
2. The steam turbine diaphragm seal structure according to claim 1, wherein: the partition plate outer ring mounting groove is annularly formed on the inner wall of the cylinder (2); the scapular part (1-4) is annularly arranged on the outer ring (1-1) of the partition plate; the outer ring (1-1) of the partition plate is provided with a plurality of sealing blocks (3), and the sealing blocks (3) wrap the outer ring (1-1) of the partition plate for a circle; the scapular parts (1-4) and the sealing blocks (3) are arranged in the installation grooves of the outer ring of the partition plate.
3. The steam turbine diaphragm seal structure according to claim 2, wherein: when the sealing blocks (3) are not heated, a cold gap is formed between every two adjacent sealing blocks (3).
4. The steam turbine diaphragm seal structure according to claim 3, wherein: the cold state gap between each two adjacent sealing blocks (3) is 0.3-0.5 mm.
5. The steam turbine diaphragm seal structure according to claim 2, wherein: each sealing block (3) is arc-shaped.
6. The steam turbine diaphragm seal structure according to claim 1, wherein: the sealing block (3) is fixedly arranged on the outer ring (1-1) of the clapboard through screws.
7. The steam turbine diaphragm seal structure according to claim 1, wherein: the sealing block (3) is made of a metal material with a large linear expansion coefficient.
8. The steam turbine diaphragm seal structure according to claim 1, wherein: and when the sealing block (3) is not heated, a mounting gap is reserved between the sealing block (3) and the bottom of the mounting groove of the outer ring of the partition plate.
9. The steam turbine diaphragm seal structure according to claim 8, wherein: the installation clearance is 0.05-0.1 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810694843.4A CN108757054B (en) | 2018-06-29 | 2018-06-29 | Steam turbine partition plate sealing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810694843.4A CN108757054B (en) | 2018-06-29 | 2018-06-29 | Steam turbine partition plate sealing structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108757054A CN108757054A (en) | 2018-11-06 |
| CN108757054B true CN108757054B (en) | 2020-12-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810694843.4A Active CN108757054B (en) | 2018-06-29 | 2018-06-29 | Steam turbine partition plate sealing structure |
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| CN (1) | CN108757054B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110925427A (en) * | 2019-12-23 | 2020-03-27 | 东方电气集团东方汽轮机有限公司 | Turbine shoulder blade non-locating surface auxiliary sealing structure and turbine shoulder blade |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10238301A (en) * | 1997-02-21 | 1998-09-08 | Mitsubishi Heavy Ind Ltd | Cooling passage of gas turbine blade |
| JPH11173103A (en) * | 1997-12-08 | 1999-06-29 | Mitsubishi Heavy Ind Ltd | Seal device for spindle bolt of gas turbine |
| CN2895745Y (en) * | 2005-12-30 | 2007-05-02 | 王东曦 | Inlaid gland-sealing-ring device between turbine partition board and partition board sleeve/cylinder |
| JP2014040800A (en) * | 2012-08-22 | 2014-03-06 | Toshiba Corp | Steam turbine |
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- 2018-06-29 CN CN201810694843.4A patent/CN108757054B/en active Active
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| CN108757054A (en) | 2018-11-06 |
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